1st New York Militia Cavalry

“Jackson Horse Guard”

1861

July 3

One hundred men from the regiment, most from Company A, volunteered for three months United States service and left the state for Washington, D.C. The regiment’s Lieutenant Colonel Thomas C. Devin commanded them with the rank of captain.

July 14

Mustered in at Washington

Provost duty in the defenses of that city; participated in skirmishes at Fall’s Church, Vienna and Lewinsville, Virginia